JP2005063355A - Optical disk device and disk device - Google Patents

Abstract

In a conventional optical disk device and a disk device, when a USB power source (VBUS) of a USB interface is used as a driving power source, the supplied current exceeds the USB standard.
A spindle motor that rotationally drives an optical disc; a feed motor that moves an optical pickup that performs at least one of reading data written to the optical disc or writing data to the optical disc in a radial direction of the optical disc; An optical disk apparatus provided with an actuator provided in the optical pickup for finely correcting the position of an objective lens for irradiating and condensing the optical disk with a laser beam, the servo motor for controlling the drive circuit of the spindle motor and the drive circuit A conversion circuit for changing the signal voltage of the servo processor and sending it to the drive circuit is provided between the signal lines, and the conversion circuit can be controlled by a CPU provided in the optical disc apparatus.
[Selection] Figure 4

Description

  The present invention relates to an optical disc apparatus that is used internally or externally in an electronic apparatus such as a personal computer. The present invention also relates to a disk device such as a magnetic disk device.

  The activation of the conventional optical media apparatus at the universal serial bus (hereinafter referred to as USB) interface will be described with reference to a block diagram.

  FIG. 14 shows a block diagram of a conventional optical disc apparatus. Here, the CPU 14 performs logic judgment and calculation. The main memory 13 has a program storage area that stores a control program and a recording control program for the optical disc recording apparatus. The buffer memory 11 is used as a storage area necessary for a storage area, recording control, and reproduction control. The feed motor 2 is driven by a motor drive circuit 6. A spindle motor 3 is driven by a motor drive circuit 6 in the same manner. A pickup unit 4 is driven by an actuator drive circuit 7. A CD servo processor 9 servo-controls the motor drive circuit 6 and the actuator drive circuit 7. The drive system power supply circuit 8 supplies power to the motor drive circuit 6.

  In the reproduction system, the optical signal obtained from the optical disc 1 and the pickup unit 4 is processed by the analog signal processing unit 5 and used as a feedback signal of the CD servo processor 9 and becomes an input signal of the digital signal processing unit 10 to the digital signal. Demodulated and the result is stored in the buffer memory 11. The buffer memory 11 is a memory for temporarily storing recording data and demodulated data. These data are transferred to and from the USB conversion IC 17 via the interface unit 12 by communication using the ATAPI bus 16.

  The USB conversion IC 17 converts the received ATAPI signal into a USB signal 18, passes through a USB connector 19, is connected to an external personal computer (host computer) 20 through a USB cable, and transfers data. The system bus 15 is a data transfer bus in the optical disc apparatus. The CPU controls the digital signal processor by a program recorded in the main memory. The digital power supply circuit 25 stably supplies various voltages to the digital signal processing unit such as the CPU 14, the digital signal processing unit 10, and the memory 13.

  The voltage supplied to the circuit portion that operates these devices is converted from AC 100 V to DC 6 V by the AC adapter 21 and supplied from the DC jack 22 to the drive. The power supply startup circuit 23 has a mechanism for supplying voltage to the drive system power supply circuit 8 digital system power supply circuit 25 in conjunction with the voltage of the power supply terminal VBUS24 of the USB connector 19, and automatically in conjunction with ON / OFF of the USB power supply. Start and stop the drive.

As a prior example, there are (Patent Document 1) (Patent Document 2) and the like.
JP 2001-144772 A JP 2001-177543 A

A conventional optical disk apparatus uses an AC adapter as described above as a driving power source. Some devices that use USB rely on the USB power supply (VBUS) of the USB interface as the drive power for the device. However, in the conventional personal computer 20, the current supplied from the USB is the maximum according to the USB standard. A supply current of 500 mA is standardized. When a current exceeding 500 mA is drawn, a warning and a USB power supply are shut down on the personal computer 20 side. On the other hand, since the conventional optical disk apparatus requires a maximum supply current of 500 mA or more, the conventional optical disk apparatus cannot be driven by the VBUS of the conventional personal computer 20.

  In order to solve such a problem, the present invention provides a rotation driving means for rotating an optical disc, an optical pickup for reading at least one of data written to the optical disc or writing data to the optical disc, and the optical pickup. Driving means for moving the optical disk in the radial direction of the optical disk, a driving circuit for the rotation driving means, a servo processor for controlling the driving circuit, a signal line for connecting the driving circuit and the servo processor, and the signal line And a conversion circuit that changes the signal voltage of the servo processor and sends it to the drive circuit, and a control means for controlling the conversion circuit.

  As a result, the electronic apparatus and the optical disc apparatus according to the present invention can avoid, for example, that the current required by the apparatus or the entire apparatus exceeds 500 mA, which is the maximum supply current temporarily supplied from the USB. USB power (VBUS) can be used as a power source.

  According to the first aspect of the present invention, there is provided a rotation driving means for rotating an optical disc, an optical pickup for reading at least one of data written to the optical disc or writing data to the optical disc, and a radius of the optical disc. A driving means for moving in the direction; a driving circuit for the rotation driving means; a servo processor for controlling the driving circuit; a signal line for connecting between the driving circuit and the servo processor; and provided in the middle of the signal line. An optical disk apparatus comprising: a conversion circuit that changes the signal voltage of the servo processor and sends it to the drive circuit; and a control means that controls the conversion circuit. Drive the spindle motor by operating the conversion circuit. Suppressing the voltage of the control signal sent to the circuit, thereby possible to suppress the transient increase of the current flowing through the spindle motor.

  In the invention according to claim 2, the conversion circuit can reduce and output the signal voltage from the servo processor sent to the drive circuit at a predetermined conversion rate, and the conversion rate can be switched under the control of the CPU. The optical disk apparatus according to claim 1, wherein the signal voltage from the servo processor sent to the drive circuit under the control of the CPU can be converted into a plurality of levels, thereby suppressing the current flowing through the spindle motor at the plurality of levels. be able to.

  According to a third aspect of the present invention, there is provided the optical disc apparatus according to the first aspect, wherein the conversion circuit operates so as to avoid that the power or current consumed by the optical disc apparatus temporarily exceeds a predetermined value. By operating the conversion circuit, it is possible to avoid that the power or current consumed by the optical disc apparatus temporarily exceeds a predetermined value.

  According to a fourth aspect of the present invention, the conversion circuit can output a reduced pressure at a first conversion rate and a second conversion rate set in advance, and the reduced pressure at the first conversion rate is a spindle motor. 2. The optical disk device according to claim 1, wherein the drive current is temporarily increased in response to a temporary increase in the drive current of the actuator, and the pressure reduction at the second conversion rate is performed in response to a temporary increase in the drive current of the actuator. Thus, the conversion circuit operates corresponding to a temporary increase in current during the operation of the optical disk apparatus, and this can be reduced.

  According to a fifth aspect of the present invention, the spindle motor drive circuit has a reference potential input section and a signal potential input section, and the servo processor operates the reference potential output section, the signal potential output section, and the conversion circuit. The reference potential input unit and the reference potential output unit are connected, and the conversion circuit includes a switch unit, a first resistor, and a second resistor, and the switch unit Has first and second terminals having a switching function and a third terminal for inputting a signal for controlling opening and closing of the first and second terminals, and the first resistor is an input of the signal potential. And a first terminal of the switch unit is connected to a wiring branched from a connection between the first resistor and the input unit of the signal potential, and a second terminal of the switch unit Is connected to the second resistor, and 2. The optical disk apparatus according to claim 1, wherein the opposite end of the resistor is connected to a wiring branched from the connection of the reference potential input section and the reference potential output section. The signal voltage, which is the voltage between the reference potential and the signal potential, can be reduced by dividing the voltage and sent to the spindle motor drive circuit.

  According to a sixth aspect of the present invention, the spindle motor drive circuit includes a reference potential input unit and a signal potential input unit, and the servo processor includes a reference potential output unit and a signal potential output unit. And a plurality of signal potential output sections for operating the conversion circuit, the reference potential input section and the reference potential output section are connected, and each of the conversion circuits includes a switch section and a first resistor. The first resistor is shared by all the conversion circuits and is connected between the signal potential input portion and the signal potential output portion, and each switch portion has a switch function. And a third terminal for inputting a signal for controlling the opening and closing of the first and second terminals, and the first resistor is between the signal potential input portion and the signal potential output portion. Connected, the first of each switch unit The child is connected to a wire branched from the connection between the first resistor and the signal potential input portion, the second terminal of the switch portion is connected to the second resistor, and is opposite to the second resistor. 2. The optical disk apparatus according to claim 1, wherein the side end portion is connected to a wiring branched from the connection of the reference potential input portion and the reference potential output portion. The signal voltage, which is the voltage between the potential and the signal potential, can be reduced to a plurality of levels by dividing and sent to the drive circuit of the spindle motor.

  According to a seventh aspect of the present invention, the switch unit is composed of a transistor and a resistor, the first terminal is the collector of the transistor, the second terminal is the emitter of the transistor, and the third terminal is the resistor. 7. The conversion circuit can be configured with an easy configuration by the optical disk device according to claim 5 or 6, wherein the other end of the resistor is connected to a base of the transistor. .

  The invention according to claim 8 is characterized in that the VBUS (voltage bus) of the universal serial bus (USB) interface is used as the power source, and the optical disk apparatus according to claim 1 has an appropriate configuration and operation of the conversion circuit. , Exceeding the maximum supply current of 500 mA supplied from the USB can be avoided.

  The invention according to claim 9 is characterized in that the conversion circuit is controlled by a program recorded in a memory and executed by a CPU, and the conversion circuit is controlled easily and in detail by the optical disk device according to claim 1. It can be carried out.

According to a tenth aspect of the present invention, there is provided a rotary driving means for rotating a disk, a recording / reproducing means for reading at least one of data written to the disk or writing data to the disk, and the recording / reproducing means for the disk. Drive means for moving the drive circuit in the radial direction, a drive circuit for the rotation drive means, a servo processor for controlling the drive circuit, a signal line for connecting the drive circuit and the servo processor, and in the middle of the signal line An electric current flowing through the spindle motor is provided by a disk device comprising: a conversion circuit provided to change the signal voltage of the servo processor to send to the drive circuit; and a control means for controlling the conversion circuit. If it becomes temporarily excessive, it is sent to the spindle motor drive circuit by operating the conversion circuit. Suppressing the voltage of the control signal, thereby possible to suppress the transient increase of the current flowing through the spindle motor.

  The best mode for carrying out the invention will be described below with reference to the drawings.

  FIG. 1 is an external view of an optical disc apparatus according to an embodiment of the present invention, FIG. 2 is an external view of an optical disc apparatus according to an embodiment of the present invention with an upper lid opened, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a block diagram showing a configuration of an optical disk device corresponding to a USB power source in one embodiment of the present invention, and FIG. 5 is a diagram in one embodiment of the present invention. FIG. 6 is a diagram showing a configuration of a voltage dividing resistor of an optical disk device, and FIG. 6 is a diagram showing a change in rotational speed and a change in driving current when the spindle motor starts up with or without a voltage dividing resistor in an optical disk device according to an embodiment of the present invention. FIG. 7 shows an actual measurement data of the difference in the spindle motor drive current at the start-up of the spindle motor with and without the voltage dividing resistance of the optical disk apparatus according to the embodiment of the present invention. FIG. 8 is a diagram showing another configuration of the voltage dividing resistor of the optical disk device according to the embodiment of the present invention, and FIG. 9 is a voltage dividing resistor of the optical disk device according to another embodiment of the present invention. Fig. 10 is a flowchart showing the control of the operation of the USB power supply and the AC adapter power supply, and Fig. 11 shows whether the personal computer is a personal computer capable of supplying 500 mA or more. FIG. 12 is a block diagram of a USB output portion of a personal computer that can connect the optical disk apparatus of the present invention and can supply power to the optical disk apparatus via USB. FIG. 13 is a connection diagram of the optical disk apparatus of the present invention. FIG. 5 is a flowchart showing control at the time of connection of a personal computer capable of supplying power to the optical disc apparatus via USB.

  In FIG. 1, an optical disk device 101 is a so-called external type that is not built in an electronic device such as a personal computer, and an optical disk is mounted by opening an upper lid 102. A USB connection connector 103 is connected to, for example, the personal computer 105 with the USB cable 104, so that the personal computer can read data from or write data to the optical disk. Reference numeral 106 denotes an AC adapter that steps down and rectifies the voltage from an outlet 107 of a commercial power supply (100 V or the like), and supplies the voltage from the DC jack 108 to the optical disc apparatus 101. As will be described in detail later, the power acquisition of the optical disc apparatus 101 may depend on the AC adapter 106 or on the USB cable 104, and the AC adapter 106 may not be used. Optical discs include CD-ROM, CD-R / RW, DVD-ROM, DVD-RAM, DVD-R / RW, DVD + R / RW, and optical disc apparatus 101 can handle one or several types of these optical discs. Is included.

  In this embodiment, a USB interface is adopted as a connection means with other electronic devices such as a personal computer. However, any connection means having both a power transmission function and a signal transmission function may be used, which is an IEEE 1394 interface. Also good.

  In addition, if the power supply circuit which makes the current voltage suitable for internal use is provided in the optical disk apparatus, the AC power supply 106 is not used and the commercial power supply is directly drawn in with an appropriate wire and connector. Also good. Further, instead of a commercial power supply, a battery built in or externally attached to the optical disk apparatus may be used as a driving power supply.

  A mechanical configuration of the optical disc apparatus will be described with reference to the drawings.

In FIG. 2, when the upper lid 102 is opened, a pickup module 109 is provided. The pickup module 109 includes a spindle motor 110 and an optical pickup 111. The spindle motor 110 includes a disk mounting portion 110a for mounting an optical disk.

  In FIG. 3, the spindle motor 110 is attached to the frame 109a with screws or the like through a bottom plate 110b. The part of the spindle motor 110 where the disk is mounted protrudes from the through hole 109c of the cover 109b toward the disk mounting surface.

  The carriage 111a of the optical pickup 111 is movably held by two substantially parallel shafts 109e and 109f fixed to the frame 109a.

  The feed motor 112 is fixed to the frame 109a, and rotates a rotating shaft 112b that is rotatably attached to the frame 109a via a gear group 112a. The rotating shaft 112b is provided in the vicinity of the shaft 109e, and is attached substantially parallel to the shaft 109e. Moreover, the rotating shaft 112b is provided on the opposite side of the shaft 109e from the shaft 109e. The rotating shaft 112b is provided with a spiral groove and is fitted with a guide 111b provided on the carriage 111a. As the rotary shaft 112b rotates, the guide 111b and the carriage 111a move in both directions (arrow A direction) along the shafts 109e and 109f. As described above, the feed motor 112, the rotary shaft 112b, and the gear group 112a as means for moving the carriage 111 are collectively stored on the opposite side of the carriage 111a with respect to the shaft 109e. The carriage 111a is configured by die-casting a metal material or the like, and is mounted with an optical system that reads and writes a disk.

  In the optical system mounted on the carriage 111a, the objective lens 111c (see FIG. 2) is configured on the actuator 111d. The actuator 111d is supported by the damper 111e and attached to the carriage 111a. The actuator 111d is provided with an actuator coil 111f. The actuator coil 111f dynamically corrects the movement of the laser light on the disk to move the actuator 111d, and the objective lens 111c is moved to correct the position of the laser light.

  Next, the configuration of the circuit system of the optical disc apparatus will be described with reference to FIG. A CPU 12 performs logic judgment and calculation. A main memory 13 has a program storage area for storing a control program and a recording control program for an optical disk recording apparatus. A buffer memory 11 is used as a storage area necessary for storage area, recording control, and reproduction control. A feed motor 2 is driven by a motor drive circuit 6. 3 is a spindle motor and is similarly driven by a motor drive circuit 6. A pickup unit 4 is driven by an actuator drive circuit 7. A CD servo processor 9 servo-controls the motor drive circuit 6 and the actuator drive circuit 7. A voltage dividing resistor 29 is provided between the motor drive circuit 6 and the CD servo processor 9. The drive system power supply circuit 8 supplies power to the motor drive circuit 6.

  In the reproduction system, the optical signal obtained from the optical disc 1 and the optical pickup 4 is processed by the analog signal processing unit 5 and used as a feedback signal of the CD servo processor 9 and becomes an input signal of the digital signal processing unit 10 to the digital signal. Demodulated and the result is stored in the buffer memory 11. The buffer memory 11 is a memory for temporarily storing recording data and demodulated data. These data are transferred to and from the USB conversion IC 17 via the interface unit 12 by communication using the ATAPI bus 16.

The USB conversion IC 17 converts the received ATAPI signal into a USB signal 18, passes through a USB connector 19, is connected to an external personal computer 20 through a USB cable, and transfers data. The system bus 15 is a data transfer bus in the optical disc apparatus.
The CPU 14 controls the digital signal processing unit by a program recorded in the main memory. The digital power supply circuit 26 stably supplies various voltages to the digital signal processing unit such as the CPU 14, the digital signal processing unit 10, and the memory 13.

  The voltage supplied to the circuit portion that operates these devices is converted from AC 100 V to DC 6 V by the AC adapter 21 and supplied from the DC jack 22 to the drive. The power supply activation circuit 25 detects the voltage of the VBUS (power supply bus) 24 of the USB connector 19 and supplies the voltage to the drive system power supply circuit 8 and the digital system power supply circuit 26 of the drive to stop or start the drive.

  In the vicinity of the VBUS 24, a VBUS inrush prevention circuit 27 that prevents an overcurrent such as a surge from entering when an electronic device such as a personal computer 20 is connected through the USB connector 19, and whether the power is supplied from the DCIN 23 or the VBUS 24 are switched. A relay circuit 28 is provided. A port for controlling the relay circuit 28 and the power supply starting circuit 25 is added to the CPU 14.

  Here, the current flowing through the drive system of the optical disc apparatus will be described. As main drive units of the optical disk apparatus, there are a spindle motor 3 (110 in FIG. 3), a feed motor 2 (112 in FIG. 3), and an actuator (mounted in the optical pickup 4, 111d in FIG. 3). An actuator drive current flows through the actuator. Since the actuator performs tracking servo and focusing servo of the laser light emitted from the objective lens 111c, the actuator drive current often varies finely. A feed motor drive current flows through the feed motor 112. The feed motor 112 drives the objective lens 111c in the radial direction of the disk, but if the actuator 111d cannot follow, the carriage 111a is driven together. Therefore, the feed motor 112 is conceptually driven intermittently, and the drive current also varies intermittently. Often becomes. A spindle motor drive current flows through the spindle motor 110. Since the spindle motor 110 rotates the disk, there is no fine variation, but a sudden increase in the spindle motor driving current may occur during acceleration of rising from a stopped state.

  Next, the voltage dividing resistor 29 will be described in detail with reference to FIG. FIG. 5A is a diagram showing the configuration of the voltage dividing resistor. The voltage dividing resistor 29 is a signal voltage conversion circuit provided between the motor drive circuit 6 and the CD servo processor 9, and is composed of resistors R1, R1, R3 and a transistor Tr. An optical disk controller (ODC) 30 is configured in the CD servo processor 9. A reference voltage (1.65V) is generated in VHALF of the ODC 30, and a spindle control signal voltage is generated in SPD. A voltage for controlling the voltage dividing circuit 29 is generated in the CPUPORT of the ODC 30 by a command from the CPU 14.

  Normally, the VHALF voltage of the ODC 30 is sent to the VHALF of the motor drive circuit 6, the SPD voltage of the ODC 30 is sent to the spindle motor control signal SPDRV of the motor drive circuit 6, and the spindle motor 3 is controlled by the SPDRV-VHALF voltage. Specifically, as shown in FIG. 5B, the spindle motor 3 accelerates when the SPDRV-VHALF voltage is larger than the reference voltage VHALF, and when the SPDRV-VHALF voltage is smaller than the reference voltage VHALF, the spindle motor. Since 3 decelerates, the spindle motor 3 is controlled by the SPDRV-VHALF voltage.

  The resistor R1 is provided between the SPDRV of the motor drive circuit 6 and the SPD of the ODC 30, and the resistor R2 is connected between SPDRV-R1 of the motor drive circuit 6 and between both VHALH of the motor drive circuit 6 and the ODC 30. The emitter-collector of the transistor Tr is interposed between SPDRV-R1 and R2 of the motor drive circuit 6.

  The operation of the voltage dividing circuit 29 will be described. When a predetermined voltage is not generated between the PORT and VHALF of the ODC 30, the collector-emitter of the transistor Tr is OFF, and there is almost no voltage drop between the point A and the point B. Therefore, the voltage between SPDRV and VHALF is almost SPD-VHALF voltage. When a predetermined voltage is generated between the CPUPORT and VHALF of the ODC 30 by a command from the CPU 14, the base-emitter of the transistor Tr becomes a predetermined voltage, and the collector-emitter of the transistor Tr is turned on, and between SPDRV-VHALF. The voltage is obtained by dividing the SPD-VHALF voltage between point A and point B and R1. Therefore, as shown in FIG. 5C, the SPDRV-VHALF voltage becomes small, and the operation of the spindle motor 3 is suppressed. Since the command from the CPU 14 to the ODC 30 can be performed by software, the voltage dividing resistor 29 can be turned ON / OFF by software. That is, the drive of the spindle motor 3 can be easily switched between the power saving mode and the normal mode by software. In the power saving mode, the drive current of the spindle motor 3 can be kept lower than in the normal mode.

  The transistor Tr functions as a switch that receives the voltage between SPD and VHALF and turns ON / OFF between the points A and C, and may be another semiconductor element that performs an equivalent function, or uses a relay. You may do it.

  Next, the operation of the voltage dividing resistor 29 to reduce the temporary increase in current consumption will be described. Switching control between the power saving mode and the normal mode for driving the spindle motor 3 by turning ON / OFF the voltage dividing resistor 29 is for a standby state with low power consumption, a steady operation state, or a disk that requires stable control of the spindle motor 3. Drive in the normal mode in the writing state, etc., and drive in the power saving mode when a large amount of power is consumed at once, such as when the feed motor 2 moves greatly or when the spindle motor is accelerated from the stopped state. Thus, a temporary increase in power consumption of the entire optical disc apparatus can be reduced.

  Typically, as shown in FIG. 6, when the spindle motor 3 rises from the stop state and accelerates, a large current temporarily flows in the spindle motor driving current. On the other hand, when the spindle motor 3 is similarly started from a stopped state with the voltage dividing resistor 29 turned on, the acceleration of the rotational speed is slow and it takes time to reach a predetermined rotational speed. The temporary rise in current is also gradual and the peak current can be kept low.

  The actually measured data in FIG. 7 is the voltage dividing resistance control signal CPUPORT, the spindle motor control signal SPDRV, the actuator control signal TRDRV, and the waveform of the consumption current of the drive system, and shows the change of the consumption current of the drive system with respect to each control signal. Since the actuator is not normally driven when the spindle motor starts up, the spindle motor control signal SPDRV is almost 0 in this measurement, and the feed motor drive current is very small. The feed motor control signal (not shown) is 0, and no feed motor drive current flows. As shown in FIG. 7A, when there is no voltage dividing resistor (CPUPORT is indicated by 0 V), the spindle motor control signal SPDRV rises (A in the figure, the lower side is positive) and the current consumption of the drive system also increases. It rises immediately (B in the figure) and reaches a certain value. On the other hand, as shown in FIG. 7B, when the voltage dividing resistor is present and ON (CPUPORT outputs an eV voltage), SPDRV is divided to a low level (FIG. 7B). The middle C, the lower side is positive), and the rise of the consumption current of the drive system (D in the figure) is also very gradual.

  Therefore, when the spindle motor 3 rises from a stopped state and accelerates, a large current flows temporarily, and when the current required by the entire optical disk apparatus temporarily exceeds 500 mA, this is done by turning on the voltage dividing resistor. Is set so as not to exceed 500 mA at all times, so that the VBUS 24 can be driven at all times.

  Next, another configuration of the voltage dividing resistor will be described with reference to FIG. In the configuration of FIG. 8, another configuration of FIG. 5 is provided. Of the two resistors contributing to the voltage division, the resistor provided between the SPDRV of the motor drive circuit 6 and the SPD of the ODC 30 is shared by two configurations. That is, the resistors R1, R2, and R3 and the transistor Tr1 constitute a first voltage dividing resistor 31, and the resistors R1, R4, R5, and the transistor Tr2 constitute a second voltage dividing resistor 32. In the first voltage dividing resistor 31, when a predetermined voltage is generated between the CPUPORT1 and VHALF of the ODC 30 in response to a command from the CPU 14, the voltage between the base and emitter of the transistor Tr1 becomes a predetermined voltage. Is turned ON, and the SPDRV-VHALF voltage is obtained by dividing the SPD-VHALF voltage by R1, the transistor Tr1, and the resistor R3. In the second voltage dividing resistor 32, when a predetermined voltage is generated between the CPUPORT2 and VHALF of the ODC 30 in response to a command from the CPU 14, the voltage between the base and emitter of the transistor Tr2 becomes a predetermined voltage. Is turned ON, and the SPDRV-VHALF voltage is the SPD-VHALF voltage divided by R1, transistor Tr1, and resistor R5. Since the first voltage dividing circuit and the second voltage dividing circuit have different voltage dividing ratios, the SPDRV-VHALF voltage is set when the first voltage dividing circuit is turned on and the second voltage dividing circuit is turned off. Three settings can be made when the first voltage dividing circuit is turned off and the voltage dividing circuit having the second configuration is turned on, and when both the first voltage dividing circuit and the second voltage dividing circuit are turned off.

  Next, the operation of this configuration will be described. In the present configuration, as described in the configuration of FIG. 5, the first voltage dividing circuit temporarily flows a large current when the feed motor 2 makes a large movement or the spindle motor 3 rises from a stopped state and accelerates. This is used when the current required by the entire optical disc apparatus exceeds 500 mA.

  The second voltage dividing circuit is used when the optical disk apparatus reads data written on the disk or writes data on the disk. When the optical disk device reads data written to the disk or writes data to the disk, the actuator operates finely, and the drive current of the actuator fluctuates greatly. This is the main cause, and the current required by the entire optical disc apparatus may temporarily exceed the allowable amount. On the other hand, the second voltage dividing circuit is turned on to suppress current consumption.

  The actual measurement data in FIG. 9 is the second voltage dividing resistor control signal CPUPORT2, the spindle motor control signal SPDRV, the actuator control signal TRDRV, and the current consumption waveform of the drive system, and the change in the current consumption of the drive system with respect to each control signal. Show. Since the spindle motor control signal SPDRV is substantially constant (e2V, the lower side is positive), the spindle motor rotates at a substantially constant speed. Note that the feed motor control signal (not shown) is 0, and no feed motor drive current flows. As shown in FIG. 9A, when the second voltage dividing resistor is OFF, the consumption current of the drive system has a pulse-like maximum value due to the influence of the pulse-like actuator drive current, which may exceed 500 mA. is there. On the other hand, as shown in FIG. 9 (b), the second voltage dividing resistor is turned ON in the portion where the pulse-like signal is generated by the actuator control signal TRDRV, that is, the portion where the pulse-like actuator driving current is generated. The voltage of the spindle motor control signal SPDRV is dropped. As a result, the spindle motor drive current is reduced at the portion where the actuator drive current increases in a pulsed manner, so that it is possible to avoid the consumption current of the drive system partially exceeding 500 mA.

  Thus, in the state where the second voltage dividing resistor is turned on in response to the pulse-like increase in the actuator drive current, the power supplied to the spindle motor 110 is reduced, but the time interval is short, and the spindle motor 110 Since the rotation speed can be substantially maintained by inertia, adverse effects such as uneven rotation do not occur.

  By overlapping the above configuration, it is possible to configure the voltage dividing circuit in three or more stages. In this case, the voltage between SPDRV and VHALF can be further finely adjusted. In the present embodiment, the voltage dividing resistor is used for controlling the current required for the entire optical disc apparatus so as not to exceed 500 mA. However, it may be a predetermined current value other than 500 mA. It may be used to temporarily prevent a current value at any part of the apparatus from exceeding a predetermined current value. Further, it may be used so that the power required by the entire optical disc apparatus or the power consumed by any part of the optical disc apparatus does not exceed a predetermined value. Furthermore, it may be used to reduce temporal fluctuations in current and power.

  Next, the control of the optical disk apparatus in which the current supplied from the power supply temporarily exceeds 500 mA by the above-described voltage dividing resistance control will be described with reference to FIGS.

  When the optical disk device is connected to the personal computer 20 via the USB connector 19 via the USB cable 27 (S1), the VBUS voltage is supplied by the personal computer 20, so that the VBUS voltage is generated by the connection and the change is detected. Then, the power activation circuit 25 operates to supply power from the VBUS to the drive system power circuit 8 and the digital system power circuit 26, and the power is turned on (S2). The CPU monitors the voltages of VBUS and DCIN. When the AC adapter 21 is connected to the DC jack 22, the CPU detects the DCIN voltage (S3), and the relay circuit 28 is set to use the AC adapter 21 as a power source. In step S4, the power from the AC adapter 21 is supplied to each power supply circuit (S5). When the AC adapter 21 is not connected to the DC jack 22, the relay circuit 28 is set to use VBUS as a power source (S6), whereby the power from the VBUS is supplied to each power circuit (S7). ) The CPU 14 detects that VBUS is a power supply (S8).

  When VBUS is used as a power source, the drive system is not moved by a command from the CPU 14 to the drive system power supply circuit 8 first, thereby starting only the circuit system while suppressing the supply current to 500 mA or less (S9). It communicates with a personal computer and confirms whether it is a specific personal computer which can supply exceeding 500 mA (S10) (the confirmation method is mentioned later). As a method of suppressing the supply current to 500 mA or less, the driving of the spindle motor 3 is switched to the power saving mode by turning on the voltage dividing resistor having the configuration shown in FIG. 5 or the first voltage dividing resistor shown in FIG. You can go. The CPU determines whether it is a specific personal computer that can supply more than 500 mA (S11), performs mechanical initialization only when it is a specific personal computer (S12), and activates the drive system with a USB power supply (S13). ). If it is recognized that the computer is a conventional personal computer, the inrush prevention circuit 27 is turned off from the power supply starting circuit 25 (S14), the supply of VBUS is stopped, and the drive is shut down (S15). Thereafter, it is not driven by the VBUS power supply until the personal computer is restarted. Thereby, in a conventional personal computer, it is possible to prevent the personal computer and peripheral devices from hanging up by accidentally supplying a current exceeding 500 mA from VBUS.

  Next, a method for the optical disk device to check whether the personal computer connected to the optical disk device can supply over 500 mA will be described with reference to FIG.

For a specific personal computer that can supply more than 500mA with VBAS, a special USB command or ATA command (vendor command) wrapped in a USB packet decided between the BIOS and the USB connected device when the optical disk device is connected via USB. It is set to issue to the optical disk device. For such setting, the BIOS of the personal computer may be set in advance from the time of shipment. Also, when the optical disk device is connected to a personal computer for the first time, dedicated driver software can be incorporated based on the Inquire information of the device. However, the driver software attached to this optical disk device can be supplied with VBAS over 500 mA by a specific personal computer. A list is created, and the personal computer determines whether this personal computer is in the list of specific personal computers. If the personal computer is a specific personal computer, a special USB command or an ATA command wrapped in a USB packet on the optical disk device ( It may be configured to incorporate a driver that issues a vendor command.

  When the optical disk device and the personal computer are connected, VBUS is turned ON, so that VBUS of the optical disk device is turned ON, and at the same time, negotiation of the BIOS of the personal computer and the optical disk device is started (S16). When the negotiation is established, it waits for a special USB command or an ATA command (vendor command) wrapped in a USB packet (S17). It is determined whether a special command has been received (S18), and if a special command is received, it is recognized as a specific personal computer that can supply more than 500 mA with VBAS (S19). If a special command is not received, it is recognized that it is not a specific personal computer that can supply more than 500 mA with VBAS (S20).

  On the other hand, on the personal computer side as well, it is desirable that the power supply can be stably supplied to the optical disc apparatus with VBUS exceeding the maximum supply current of 500 mA. Next, a configuration of a personal computer that can stably supply power to an external device with a VBUS exceeding a maximum supply current of 500 mA will be described with reference to FIGS. 12 and 13.

  When the personal computer is activated, the personal computer acquires Inquire information of the optical disk device connected via USB (S21), and identifies whether the optical disk device is an optical disk device that requires a current exceeding 500 mA in VBAS (S22). As an identification method, an ID list of an optical disk device that requires a current exceeding 500 mA in VBAS is set in advance in the BIOS of the personal computer in advance, and collation with the ID of the connected optical disk device is performed. May be. Also, an ID is taken into the personal computer by the PC driver software attached to the optical disk device that requires a current exceeding 500 mA in VBAS, and the ID of the device connected by USB is an optical disk device that requires a current exceeding 500 mA in VBAS. It may be recognized as an ID.

  When the personal computer is activated, the BIOS rises and the VBUS power is supplied from the USB power source 28. The personal computer monitors the VBUS current with the current detection circuit in the USB power supply 28, and monitors whether the recognized USB-connected device is an optical disk device that requires more than 500 mA in VBAS. The current threshold value is changed (S22). If it is not an optical disk device that requires more than 500 mA in VBAS, the threshold value of the VBUS current is set to the threshold value A (S23), and if it is an optical disk device that requires more than 500 mA in VBAS, the threshold value of the VBUS current is set to the threshold value B. (S24). The threshold value A is preferably an effective value current of 500 mA, and may be an inrush current of 1.5 A or more in order to cope with an inrush current at the time of USB connection. The threshold value B is preferably a value exceeding the effective value current of 500 mA.

  Next, the current of VBUS being monitored is compared with the threshold value (S26), and if it is less than the threshold value, the startup operation of the personal computer is continued (S27). If it is equal to or greater than the threshold value, the USB interface port is blocked (S28), and the startup operation is continued (S27). In the start-up operation, as described above, the negotiation between the BIOS of the personal computer and the optical disk device is started, and in the case of the optical disk device that can be started by VBUS, a specific personal computer that can supply a current exceeding 500 mA from the personal computer BIOS by the USB signal. A vendor command indicating that there is a certain issue is issued.

With such a configuration, when the AC adapter is connected, all computers operate with the power of the AC adapter, and when the USB power supply is not connected to the AC adapter, it is operated on a specific computer with enhanced USB power. It is possible to realize an optical disc apparatus that only allows USB power supply driving and can be prevented from being driven by a USB power supply when connected to a conventional computer.

  In this embodiment, an example in which a USB-connected optical disk device is connected to a personal computer is described. However, the present invention is not limited to a USB-connected optical disk device, and may be an electronic device (USB device) capable of USB connection. In this case, the USB device can supply power for operation from a personal computer via USB, and is effective when the supply current at VBUS exceeds 500 mA. The personal computer is set to be able to supply power to the USB device. In this case, the supply current is effective when the supply current can exceed 500 mA. When the USB device and the personal computer are both a USB device that requires a VBUS supply current exceeding 500 mA and a PC that can supply a VBUS exceeding 500 mA, and distinguishing each other from other USB devices or personal computers It is effective for. The target to which the USB device is connected is not limited to a personal computer, and may be an electronic device that can be connected by USB and can supply power to the connected device. In this case, a specific command indicating that the electronic device is a specific electronic device whose USB power supply is strengthened by means of depending on the BIOS or not depending on the BIOS is issued as a USB signal.

  In this embodiment, the optical disk apparatus has been described as an example. However, the present invention can also be applied to other disk apparatuses such as a magnetic disk apparatus such as a hard disk apparatus.

  The present invention can be applied to other disk devices such as an optical disk device and a magnetic disk device such as a hard disk device, and can be effectively applied to an optical disk device and other disk devices that can be connected by USB and can be powered by USB.

1 is an external view of an optical disc apparatus according to an embodiment of the present invention. FIG. 1 is an external view of an optical disk device according to an embodiment of the present invention with an upper lid opened. 1 is an external view of a pickup module of an optical disc device according to an embodiment of the present invention as viewed from the back side. 1 is a block diagram showing a configuration of an optical disc apparatus corresponding to a USB power source in an embodiment of the present invention The figure which shows the structure of the voltage dividing resistance of the optical disk apparatus in one embodiment of this invention The figure which shows the change of the rotation speed at the time of spindle motor start-up with the presence or absence of the partial pressure resistance of the optical disk apparatus in one embodiment of this invention, and the change of a drive current The figure which shows the actual measurement data of the difference in the spindle motor drive current at the time of spindle motor start-up with the presence or absence of the partial pressure resistance of the optical disk apparatus in one embodiment of this invention The figure which shows another structure of the voltage dividing resistance of the optical disk apparatus in one embodiment of this invention The figure which shows the actual measurement data of the difference in a spindle motor drive current with the presence or absence of the voltage dividing resistance of the optical disk apparatus in another one Embodiment of this invention. Flow chart showing control of operation with USB power supply and AC adapter power supply Flowchart showing control in which the optical disc apparatus confirms whether the personal computer is a personal computer capable of supplying 500 mA or more. Block diagram of a USB output portion of a personal computer to which the optical disk apparatus of the present invention is connected and power can be supplied to the optical disk apparatus via USB The flowchart which shows the control at the time of the connection of the personal computer which can connect the optical disk apparatus of this invention and can supply the electric power to an optical disk apparatus by USB Block diagram of a conventional optical disk device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Feed motor 3 Spindle motor 4 Pickup unit 5 Analog signal processing part 6 Motor drive circuit 7 Actuator drive circuit 8 Drive system power supply circuit 9 CD servo processor 10 Digital signal processing part 11 Buffer memory 12 CPU
13 Main memory 14 CPU
15 System bus 16 ATAPI bus 17 USB conversion IC
18 USB signal 19 USB connector 20 PC 21 AC adapter 22 DC jack 24 VBUS
25 Power Supply Start Circuit 26 Digital Power Supply Circuit 27 Inrush Prevention Circuit 28 Relay Circuit 29 Voltage Dividing Resistance 30 Optical Disk Controller (ODC)
31 First Voltage Dividing Resistor 32 Second Voltage Dividing Resistor 101 Optical Disc Device 102 Upper Cover 103 USB Connector 104 USB Cable 105 Personal Computer 106 AC Adapter 107 Outlet 108 DC Jack 109 Pickup Module 109a Frame 109b Cover 109c Through Hole 109e, 109f Shaft 110 Spindle motor 110a Disk mounting part 110b Bottom plate 111 Optical pickup 111a Carriage 111b Guide 111c Objective lens 111d Actuator 111e Damper 111f Actuator coil 112 Feed motor 112a Gear group 112b Rotating shaft

Claims (10)

A rotation driving means for rotating the optical disc, an optical pickup for reading data written on the optical disc or writing data to the optical disc, and a driving means for moving the optical pickup in the radial direction of the optical disc; A drive circuit for the rotation drive means, a servo processor for controlling the drive circuit, a signal line for connecting the drive circuit and the servo processor, and a signal voltage of the servo processor provided in the middle of the signal line An optical disc apparatus comprising: a conversion circuit for changing the length of the signal to the drive circuit; and a control means for controlling the conversion circuit. The conversion circuit is capable of reducing and outputting a signal voltage from a servo processor to be sent to a drive circuit at a predetermined conversion rate, and the conversion rate can be switched by control by a CPU. 1. The optical disc device according to 1. 2. The optical disk apparatus according to claim 1, wherein the conversion circuit operates so as to avoid that the power or current consumed by the optical disk apparatus temporarily exceeds a predetermined value. The conversion circuit can output a reduced pressure at a first conversion rate and a second conversion rate set in advance, and the reduced pressure at the first conversion rate temporarily increases the drive current of the spindle motor. 2. The optical disc apparatus according to claim 1, wherein the pressure reduction at the second conversion rate is performed in response to a temporary increase in driving current of the actuator. The drive circuit of the spindle motor has a reference potential input section and a signal potential input section, and the servo processor has a reference potential output section, a signal potential output section, and a signal potential output section for operating the conversion circuit, The reference potential input section and the reference potential output section are connected to each other, and the conversion circuit includes a switch section, a first resistor, and a second resistor, and the switch section has a switch function. A second terminal and a third terminal for inputting a signal for controlling opening and closing of the first and second terminals, and the first resistor is between the signal potential input portion and the signal potential output portion. A first terminal of the switch unit is connected to a wiring branched from a connection between the first resistor and the signal potential input unit, and a second terminal of the switch unit is the second resistor And the opposite end of the second resistor is Serial reference potential optical disk apparatus according to claim 1, characterized in that it is connected to a wiring that branches from the connection of the output of the input section and the reference potential. The spindle motor drive circuit includes a reference potential input unit and a signal potential input unit, and the servo processor operates a plurality of reference circuit output units, a signal potential output unit, and the conversion circuit. The reference potential input section and the reference potential output section are connected, and each of the conversion circuits is constituted by a switch section, a first resistor, and a second resistor, The first resistor is shared by all the conversion circuits and connected between the signal potential input portion and the signal potential output portion, and each switch portion has a first and second terminal having a switch function and the first and second terminals. A third terminal for inputting a signal for controlling opening and closing of the second terminal, and the first resistor is connected between the signal potential input portion and the signal potential output portion, The first terminal is connected to the first resistor Connected to the wiring branched from the connection between the input portions of the signal potential, the second terminal of the switch portion is connected to the second resistor, and the opposite end of the second resistor is connected to the reference potential. 2. The optical disk apparatus according to claim 1, wherein the optical disk apparatus is connected to a wiring branched from the connection between the input section and the output section of the reference potential. The switch section is composed of a transistor and a resistor, the first terminal is the collector of the transistor, the second terminal is the emitter of the transistor, the third terminal is one end of the resistor, and the other resistor 7. The optical disc apparatus according to claim 5, wherein an end is connected to a base of the transistor. 2. The optical disk apparatus according to claim 1, wherein the power source is a VBUS (voltage bus) of a universal serial bus (USB) interface. 2. The optical disk apparatus according to claim 1, wherein the conversion circuit is controlled by a program recorded in the memory and executed by the control means. Rotation driving means for rotating the disk, recording / reproducing means for reading data written on the disk or writing data to the disk, and driving means for moving the recording / reproducing means in the radial direction of the disk A drive circuit for the rotation drive means, a servo processor for controlling the drive circuit, a signal line for connecting the drive circuit and the servo processor, and a signal voltage of the servo processor provided in the middle of the signal line A disk device comprising: a conversion circuit that changes the size of the signal to be sent to the drive circuit; and a control unit that controls the conversion circuit.

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